KR101513160B1 - Liquid crystal display device having heat radiation sheet - Google Patents

Abstract

The present invention relates to a liquid crystal display device having a heat radiation sheet and capable of preventing a temperature rise, An LED substrate on which a plurality of LEDs (LIght Emitting Device) for emitting light are mounted; A light guide plate disposed under the liquid crystal panel and guiding the light emitted from the LED unit to the liquid crystal panel; And a heat radiation sheet disposed below the light guide plate and the LED substrate to emit heat generated from the LED.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which heat is easily emitted in a small-sized liquid crystal display device.

2. Description of the Related Art In recent years, a flat panel display device such as a liquid crystal display (LCD) has been applied as a display device to various portable electronic devices such as a mobile phone, a notebook computer, and a tablet computer, .

Such a liquid crystal display element is a transmissive display element, and displays a desired image on the screen by controlling the amount of light transmitted through the liquid crystal layer by refractive index anisotropy of liquid crystal molecules. Therefore, in a liquid crystal display element, a back light, which is a light source that transmits the liquid crystal layer for displaying an image, is provided. Generally, the backlight can be roughly divided into two types.

The first is a side-view backlight that is installed on the side of the liquid crystal panel to provide light to the liquid crystal layer, and the second is a direct-type backlight that provides light directly below the liquid crystal panel.

The side-type backlight is provided on the side surface of the liquid crystal panel and can supply light to the liquid crystal layer through the reflection plate and the light guide plate. Therefore, since the thickness can be made thinner, it is mainly used for a notebook or the like requiring a thin display device. However, the side-type backlight is difficult to apply to a large-sized liquid crystal panel because the lamp that emits light is disposed on the side surface of the liquid crystal panel, and light is supplied through the light guide plate. Therefore, there is a problem in that it is not suitable for a liquid crystal panel for a large-sized LCD TV, which has recently been spotlighted.

Since the light emitted from the lamp is directly supplied to the liquid crystal layer, the direct-type backlight can be applied not only to a large-sized liquid crystal panel but also to a high-brightness liquid crystal panel.

On the other hand, as a backlight lamp, a light source that emits light by itself such as a light emitting device instead of a fluorescent lamp is used. Since the light emitting device emits R, G, and B monochromatic light, the color reproduction ratio is good when applied to a backlight and the driving power can be reduced.

1 is a cross-sectional view showing a structure of a conventional liquid crystal display device provided with a backlight having LEDs.

1, the liquid crystal display element includes a first substrate 1 and a second substrate 3, and a liquid crystal layer (not shown) between the first substrate 1 and the second substrate 3 and implements an image as a signal is applied from the outside An LED substrate 32 mounted on the lower side surface of the liquid crystal panel 10 to mount a plurality of LEDs 34 for emitting light and disposed on the lower side of the liquid crystal panel 10; A light guide plate 35 for guiding the light emitted from the LED 34 and supplying the light to the liquid crystal panel 10 and a light guide plate 35 provided between the liquid crystal panel 10 and the light guide plate 35 and guided from the light guide plate 35, An optical sheet 38 composed of a diffusing sheet 38a and prism sheets 38b and 38c for diffusing and condensing the light supplied to the light guide plate 10 and an optical sheet 38 disposed below the light guide plate 35, A reflection plate 36 for reflecting the light to be guided and a lower plate 36 for receiving the reflection plate 36, the light guide plate 35, the optical sheet 38 and the LED substrate 32 A light guide plate 35, an optical sheet 38 and an LED substrate 32 assembled with the bottom cover 40 and the liquid crystal panel 10 is placed on the reflector 36, A guide panel 42 and an upper cover 46 coupled with the guide panel 42 to assemble the liquid crystal panel 10.

The first substrate 1 of the liquid crystal panel 10 is a thin film transistor array substrate on which thin film transistors are formed. In addition to the thin film transistors, various wirings and pixel electrodes are formed on the first substrate 1. The second substrate 2 is a color filter substrate, and a color filter layer and a black matrix are formed.

The lower cover 40 assembles a backlight including a reflective layer 36, a light guide plate 35, an optical sheet 38, an LED 34, and the like. The wall surface extends upward from the bottom surface, The backlight is assembled by placing parts inside the wall surface. The upper cover 46 is assembled with the guide panel 42 and the lower cover 40 to assemble the backlight with the liquid crystal panel 10.

The LED substrate 32 is disposed on at least one side of the light guide plate 35 and a plurality of LEDs 34 are disposed on the LED substrate 32. Thus, Is incident on the light guide plate 35 through the side surface of the light guide plate 35, that is, the light entrance surface, and then the light is supplied to the liquid crystal panel 10.

On the other hand, the LED 34 generates more heat than a fluorescent lamp. Therefore, when the LED 34 is used as the light source of the backlight, the temperature of the liquid crystal display element is increased as compared with the case of using the fluorescent lamp, the lifetime of the LED 34 is shortened and the light guide plate and the optical sheet are deteriorated, 10 are deteriorated to cause defects. Therefore, when the LED 34 is used as a light source, the heat generated from the LED 34 must be rapidly discharged to the outside to prevent the temperature of the liquid crystal display device from rising.

In the conventional liquid crystal display device shown in FIG. 1, the LED substrate 32 is formed of a metal material having a predetermined area, and an FPC (Flexible Printed Circuit; not shown) made of a flexible film is formed on the LED substrate 32, To electrically connect the LED 34 to the outside. Further, the lower cover 40, the guide panel 42, and the upper cover 46 are formed of a metal having a high thermal conductivity.

1 is discharged to the outside through the LED substrate 32, the lower cover 40, the guide panel 42, and the upper cover 46, so that the liquid crystal display The temperature of the device can be prevented from rising.

However, the liquid crystal display element having the structure shown in FIG. 1 is a large liquid crystal display element which is mainly applied to an electronic apparatus such as a TV or a notebook computer, and a small liquid crystal display element applied to a mobile apparatus such as a mobile phone has a structure similar to that of FIG. It has a different structure.

Fig. 2 shows the structure of a conventional small liquid crystal display device. The structure of the small liquid crystal display element shown in Fig. 2 is similar to that of the large liquid crystal display element shown in Fig. 1, and only the assembly structure of the LED 34 and the LED substrate 32 is different. It is omitted.

In this case, although the shape of the guide panel differs in the liquid crystal display device having the structure shown in FIGS. 1 and 2, the shape of the guide panel can be variously formed according to the assembly relation of the structures other than the area of the liquid crystal panel. References to shapes are omitted. In the small liquid crystal display element shown in Fig. 2, the upper cover is removed, but the upper cover can be assembled if necessary.

2, the plurality of LEDs 34 are disposed on the side surface of the light guide plate 35 and face the light incidence surface of the light guide plate 35. As shown in Fig. 1, the LED substrate 32 is disposed between the light guide plate 35 and the guide panel 42, and the LED substrate 32 is mounted on the LED substrate 32. In this case, The LED substrate 32 is formed so as to be in contact with the lower cover 40 or the guide panel 42 while the LED substrate 32 is formed to be in contact with the light guide plate 35 and the guide panel 42, So that the mounting surface of the LED substrate 32 faces downward and only the LED 34 is disposed between the guide panel 42 and the light guide plate 35.

As described above, in the small liquid crystal display device, the LED substrate 32 is disposed on the upper surface of the light guide plate 35 and the guide panel 42 in order to minimize the size of the liquid crystal display device. Since a small liquid crystal display device is mainly used in a mobile communication device, the size of the liquid crystal display device is minimized and the weight thereof must be minimized. Therefore, the size of the liquid crystal display device is made larger than that of a large- .

1, since the rear surface of the large-area LED substrate 32 contacts the bottom cover 40 or the guide panel 42, when heat is generated in the LED 32, The heat is transmitted to the lower cover 40 or the guide panel 42 through the substrate 32 and is emitted to the outside. In the small liquid crystal display device having the structure shown in FIG. 2, Only the upper surface of the guide panel 42 comes into contact with the upper surface of the guide panel 42, thereby lowering the heat emission efficiency.

Further, in the large liquid crystal display element shown in Fig. 1, while the LED substrate 32 made of metal is used, in the small liquid crystal display element having the structure shown in Fig. 2, the LED 34 is directly mounted on the FPC having low thermal conductivity , The heat generated by the LED 34 can not be substantially radiated to the outside through the FPC and the guide panel 42. As a result, there is a problem in preventing the temperature rise by the LED 34 in the small liquid crystal display device .

An object of the present invention is to provide a liquid crystal display element which is capable of preventing the rise of temperature by releasing heat smoothly by providing a heat radiation sheet.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel; A plurality of LEDs (LIght Emitting Device) for emitting light; A light guide plate disposed under the liquid crystal panel and guiding light emitted from the LED to the liquid crystal panel; A guide panel for supporting the liquid crystal panel and the light guide plate; An LED substrate which is made of a plastic film and in which a part of a mounting scene in which a plurality of LEDs are mounted is disposed on the guide panel and the light guide plate so that the LED is disposed between the guide panel and the light guide plate; And a heat-radiating sheet disposed below the light guide plate and facing the LED substrate to emit heat generated from the LED.

The LED substrate is made of a plastic film so that a mounting surface where the LED is mounted is placed in a part of the light guide plate and the guide panel, and the LED is disposed between the light guide plate and the guide panel.

The heat-radiating sheet is made of graphite or metal. The shape of the heat-radiating sheet is determined depending on the arrangement of LEDs, the area of the liquid crystal panel, the material and thickness of the lower cover, Depending on the area.

In the present invention, the heat-radiating sheet is disposed below the light guide plate and the LED substrate to efficiently emit heat generated from the LEDs, thereby preventing temperature rise due to heat generated by the LEDs.

1 is a cross-sectional view showing the structure of a conventional large liquid crystal display device.
2 is a cross-sectional view showing a structure of a conventional small liquid crystal display device.
3 is an exploded perspective view showing a structure of a liquid crystal display element according to the present invention.
4 is a sectional view showing a structure of a liquid crystal display element according to the present invention.
5 is a view showing a structure of a graphite heat-radiating sheet according to the present invention.
6 is a view showing a structure of a metal heat-radiating sheet according to the present invention.
Fig. 7A is a diagram showing the thermal distribution of a conventional liquid crystal display element. Fig.
7B is a view showing thermal distribution of a liquid crystal display element of the present invention to which a graphite heat-radiating sheet is applied;
7C is a view showing thermal distribution of a liquid crystal display element of the present invention to which a metal heat-radiating sheet is applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view showing a structure of a liquid crystal display element according to the present invention, and FIG. 4 is a sectional view of the assembled liquid crystal display element.

3 and 4, the liquid crystal display according to the present invention includes a liquid crystal panel 110 and a backlight. The liquid crystal panel 110 includes a first substrate 101 and a second substrate 103, and a liquid crystal layer (not shown) between the first substrate 101 and the second substrate 103, and implements an image as a signal is applied from the outside.

The backlight includes a plurality of LEDs (Light Emitting Device) 134 disposed on the lower side of the liquid crystal panel 110 to emit light and a plurality of LEDs 134 disposed below the liquid crystal panel 110 to emit light A light guide plate 135 for guiding the liquid crystal panel 110 to the liquid crystal panel 110 and supplying the liquid crystal panel 110 to the liquid crystal panel 110 and a light guide plate 135 disposed between the liquid crystal panel 110 and the light guide plate 135, An optical sheet 138 including a diffusing sheet 138a and prism sheets 138b and 138c for collecting and condensing the light reflected from the light guide plate 135 and a reflection plate 136 And a heat radiation sheet 152 disposed on the reflection plate 136 and emitting heat generated from the LED 134.

The LED 134 is disposed only on one side of the light guide plate 135 and supplies light to the liquid crystal panel 110 through the light incident surface on one side of the light guide plate 135. The LED 134 is disposed on both sides of the light guide plate 135 So that light can be supplied to the liquid crystal panel 110 through the light incident surface on two sides.

The reflection plate 136, the light guide plate 135 and the optical sheet 138 of the backlight are housed in the lower cover 140 and then assembled as the lower cover 140 and the guide panel 142 are coupled.

A liquid crystal panel 110 is placed on the guide panel 142. The guide panel 142 is formed in a rectangular shape so that an edge area of the liquid crystal panel 110 is placed on the guide panel 142 and the liquid crystal panel 110 and the backlight are assembled to complete the liquid crystal display device.

The liquid crystal panel 110 is not provided with an engagement portion to be coupled to the lower cover 140 and the guide panel 142 but an upper cover is disposed in an upper edge region of the liquid crystal panel 110, By being coupled with the guide panel 142, the backlight can be assembled with the liquid crystal panel 110.

Though not shown in the figure, a plurality of gate lines and data lines are vertically and horizontally arranged on the first substrate 101 to define a plurality of pixel regions, and a thin film transistor serving as a switching element is formed in each pixel region A pixel electrode formed on the pixel region is formed. The thin film transistor includes a gate electrode connected to a gate line, a semiconductor layer formed by stacking amorphous silicon or the like on the gate electrode, and a source electrode and a drain electrode formed on the semiconductor layer and connected to the data line and the pixel electrode .

The second substrate 102 includes a color filter composed of a plurality of sub-color filters embodying colors of red (R), green (G) and blue (B) And a black matrix for blocking light passing through the liquid crystal layer.

The first substrate 101 and the second substrate 102 constituted as described above are adhered to each other by a sealant (not shown) formed on the periphery of the image display region to constitute a liquid crystal panel, and the first substrate 101 (Not shown) formed on the first substrate 101 or the second substrate 102. As shown in FIG.

Although not shown in the drawing, a first polarizer and a second polarizer are attached to the first substrate 101 and the second substrate 102, respectively, to polarize light input to and output from the liquid crystal panel 110, .

The light guide plate 135 guides the light input from the LED 134 to the liquid crystal panel 110. The light incident on one side of the light guide plate 135 is reflected by the upper surface and the lower surface of the light guide plate 135, And then outputted to the outside of the light guide plate 135. At this time, the light guide plate 135 is formed of a rectangular parallelepiped, and a pattern or a groove may be formed on the bottom surface thereof in order to scatter incident light.

The optical sheet 138 is supplied to the liquid crystal panel 110 by improving the efficiency of light output from the light guide plate 135. The optical sheet 138 includes a diffusion sheet 138a for diffusing the light output from the light guide plate 138 and a first diffusion sheet 138a for condensing light diffused by the diffusion sheet to supply uniform light to the liquid crystal panel 110. [ A prism sheet 138b and a second prism sheet 138c. At this time, the diffusion sheet 138a is provided with one sheet, but the prism sheet includes a first prism sheet 138b and a second prism sheet 138c in which the prism crosses vertically in the x-, y- The light is refracted in the axial direction to improve the linearity of the light.

As the LED 134, R, G, B LEDs emitting white light of R (Red), G (Green) and B (Blue), or LED devices emitting white light may be used.

When monochromatic LEDs emitting monochromatic light are arranged, monochromatic LEDs of R, G, and B are alternately arranged at regular intervals to mix monochromatic light emitted from the LEDs into white light and then to the liquid crystal panel 110, A plurality of LED elements are arranged at regular intervals to supply white light to the liquid crystal panel 110. [

The white light LED device comprises a blue LED that emits blue light and a phosphor that emits yellow light by absorbing blue monochromatic light. The blue monochromatic light output from the blue LED and the yellow monochromatic light emitted from the phosphor are mixed to form a liquid crystal And is supplied to the panel 110. Although the LED 134 is disposed on one side of the light guide plate 135 in the drawing, the LED 134 may be disposed on both sides of the light guide plate 135.

The LED 134 is mounted on an LED substrate 132 made of a flexible film. The mounting surface where the LED 134 is mounted is directed downward and the mounting surface is fixed on a part of the light guide plate 135 and the guide panel 142. The LED 134 is mounted on the light guide plate 135, Light is incident on the light incidence surface of the light guide plate 135 by being positioned in the space between the light guide plate 135 and the guide panel 142.

Although not shown in the drawing, the LED substrate 132 is connected to an external driving circuit portion, and an external signal is supplied to the LED controller for signal and power, and the LED controller drives the LED 134 according to the input signal . At this time, a flexible circuit board (not shown) is attached to the LED substrate 132 of the flexible film, and the flexible circuit board is connected to an external driving circuit. Signal lines are formed on the upper surface and / or the lower surface of the flexible circuit board, and signals of the driving circuit are input to the LED board 132 through the signal lines of the flexible circuit board.

The reflection plate 136 disposed below the light guide plate 135 reflects light directed to the lower portion of the light guide plate 135 incident from the LED 134 to be supplied to the liquid crystal panel 110. The reflection plate 136 is formed in a shape similar to the lower surface of the light guide plate 135 and reflects all the light emitted through the lower surface of the light guide plate 135. As shown in FIG. 3, And may reflect the light emitted through the three side surfaces of the light guide plate 135. The light guide plate 135 may be formed of a resin material. The reflector 136 may extend to two sides of the light guide plate 135 when the LEDs 134 are disposed on both sides of the light guide plate 135. [

A heat radiation sheet 152 is disposed below the reflection plate 136. The heat-radiating sheet 152 emits heat generated from the LED 134 to prevent the temperature of the liquid crystal display device from rising. As shown in the drawing, the heat-radiating sheet 152 is formed on the entire lower portion of the light guide plate 135 and a plurality of the LEDs 132 to emit heat.

The lower cover 140 is disposed on the lower portion of the heat dissipation sheet 152 so that the heat dissipation sheet 152 and the lower cover 140 are in contact with each other, To the lower cover 140 and is discharged to the outside.

The lower cover 140 is composed of a bottom surface positioned below the heat radiation sheet 152, a side surface of the light guide plate 135 and a rear surface of the LED substrate 132. The reflection layer 136, The optical sheet 138, and the like are accommodated and the backlight is assembled. An external driver (not shown) is provided outside the lower cover 140 to apply a signal to the liquid crystal panel 110 and the LED 134.

The guide panel 142 is coupled to the lower cover 140 in such a manner that the upper surface thereof surrounds the edge of the optical sheet 138 of the liquid crystal panel 110 and the side surface of the lower cover 140. On the upper surface of the guide panel 142, a liquid crystal panel 110 is seated and assembled. Although not shown in the drawing, an outer cover of the liquid crystal panel 110 may be covered with an upper cover.

The LED 134 is mounted on the LED substrate 132 made of a plastic film having a very low thermal conductivity and the LED substrate 134 is mounted on the guide panel 142 and the light guide plate 135, The LED substrate 134 is brought into contact with only the minimum area of the guide panel 142 having good thermal conductivity. Therefore, the heat generated from the LED 132 can not be emitted to the outside through the LED substrate 134.

However, in the present invention, a heat-radiating sheet 152 is provided under the backlight to emit heat generated from the LED 132 to the outside. At this time, since the heat-radiating sheet 152 is in wide contact with the metallic lower cover 140, heat is smoothly removed through the lower cover 140.

The heat dissipation sheet 152 is formed in a shape similar to that of the light guide plate 135. The heat dissipation sheet 152 may be formed by various factors such as the arrangement of the LEDs 134 and the material and thickness of the lower cover 140 . The reason for preventing temperature rise by emitting heat from the liquid crystal display element is that it adversely affects various components of the liquid crystal display element due to temperature rise or the user feels uncomfortable due to temperature rise. Therefore, it is also important to lower the temperature of the liquid crystal display element as a whole, but it is also possible to remove the region where the temperature rises locally by spreading the heat throughout the liquid crystal display element or to remove the region where the main components, (Such as a portion of the face of the phone when talking on the phone), etc. It is also important to lower the temperature. Accordingly, the shape of the heat-radiating sheet 152 may be designed as necessary to control the heat conduction path of the heat generated by the LED 134, thereby obtaining a desired effect.

The heat-radiating sheet 152 may be formed of graphite. The graphite is a hexagonal stable structure formed by firing carbon at a high temperature (2,500 to 3,000 DEG C) for about two weeks under air-shielded condition, and has good thermal conductivity, good heat resistance and corrosion resistance. Generally, graphite has a thermal conductivity of 2 times that of steel, 1/3 of copper and 2/3 of aluminum.

The heat-radiating sheet 152 made of graphite may be non-tacky or may be tacky.

The non-tacky graphite smoothing sheet 152 is disposed between the reflector 136 and the lower cover 140 without being tacky and adhered to the reflector 136 and the lower cover 140 by a mechanical force, Releases heat.

5, the viscous graphite heat-radiating sheet 152 includes a graphite sheet 152a, a heat-resistant adhesive 152b applied to one surface of the graphite sheet 152a, and a heat-resistant adhesive 152b attached to the heat- And a release film 152c.

The heat release sheet 152 is removed from the heat release sheet 152 by the heat resistant adhesive 152b after the release film 152c is removed from the heat radiation sheet 152 when the heat radiation sheet 152 is attached to the reflection plate 136 and the LED 154, The graphite sheet 152a is brought into close contact with the reflection plate 154 and the LED 154 without an air gap by the heat resistant adhesive 152b so that the heat generated by the LED 154 Is smoothly flowed through the graphite sheet 152a without being lost by the air gap, thereby increasing the heat emission efficiency.

As the heat-radiating sheet 152, a metal sheet may be used. As shown in FIG. 6, the metal heat-radiating sheet 152 is composed of a copper sheet 152d and first and second stainless sheets 152e and 152f formed on the top and bottom of the copper sheet 152d.

Copper is generally known to have a very high thermal conductivity, but it is difficult to maintain its shape because it has ductility. According to the present invention, it is possible to prevent the copper sheet 152d from being bent by attaching high strength stainless steel to both surfaces, with copper having a good thermal conductivity.

The first and second stainless steel sheets 152e and 152f may be formed to have a thickness of 0.02-0.04 mm and preferably a copper sheet 152d, And the first and second stainless steel sheets 152e and 152f are each formed to have a thickness of 0.03 mm.

Although not shown in the drawing, the heat-radiating sheet 152 is composed of a copper sheet 152d and a stainless sheet 152e on the upper surface, and the lower surface of the copper sheet 152d is directly connected to a lower cover 140 made of stainless steel The thickness of the heat radiation sheet 152 can be minimized.

Figs. 7A, 7B and 7C are thermal distributions of the liquid crystal display elements measured by a thermal imaging camera, Fig. 7A is thermal distribution of the conventional liquid crystal display element shown in Fig. 2, and Fig. 7B is a graph FIG. 7C shows thermal distribution of a liquid crystal display element according to the present invention employing a metal sheet using copper and stainless steel as a heat-radiating sheet.

First, as shown in Figs. 7A, 7B, and 7C, the temperature of the region where the LED is mounted (the lower side of the liquid crystal display element in the drawing) in all the liquid crystal display elements is the highest and the temperature becomes lower as the distance is further from the region.

In the case of the conventional liquid crystal display device shown in FIG. 2, the maximum temperature in the region where the LED is mounted was 40.9 DEG C, and the temperature was lowered as the distance from the region was increased. In the case of the liquid crystal display element according to the present invention, the highest temperature was 37.05 占 폚 in the region where the LED was mounted, and the temperature was lower as the distance from the region was increased. Therefore, in the case of a liquid crystal display device using a graphite heat-radiating sheet, the maximum temperature reached 90.5% as compared with the conventional maximum temperature.

In the case of the structure using the metal heat-dissipating sheet in the liquid crystal display according to the present invention, the maximum temperature in the region where the LED is mounted was 35.4 DEG C, and the temperature was lower as the distance from the region was increased. Therefore, in the case of a liquid crystal display device using a metal heat-radiating sheet, the maximum temperature reached 86.6% as compared with the conventional maximum temperature.

As described above, according to the present invention, when the heat-radiating sheet is applied, it is found that the maximum temperature is lower than that of the conventional heat-radiating sheet, and the heat-radiating sheet smoothly discharges heat generated from the LED.

While the present invention has been described in detail in the above detailed description, the present invention is not limited to this specific structure. For example, in the above-described detailed description, a structure in which a small liquid crystal display element of a conventional structure shown in FIG. 2, that is, an LED substrate is formed of a flexible film and is disposed on the upper surface of the light guide plate and the guide panel, However, the present invention is not limited to such a structure, but may be applied to the large liquid crystal display device shown in Fig. 1, the LED substrate is made of metal, and the metal contacts the lower substrate and the guide panel to smoothly emit heat. However, even in this structure, a heat radiation sheet is provided on the lower surface of the reflector and the LED substrate The heat radiation efficiency can be further improved.

In other words, the liquid crystal display device using the basic concept of the present invention can be easily created by anyone who is skilled in the art to which the present invention belongs.

110: liquid crystal panel 135: light guide plate
138: optical sheet 132: LED substrate
134: LED 136: Reflector
140: lower cover 142: guide panel
152: Heat-radiating sheet

Claims (12)

A liquid crystal panel;
A plurality of LEDs (LIght Emitting Device) for emitting light;
A light guide plate disposed under the liquid crystal panel and guiding light emitted from the LED to the liquid crystal panel;
A guide panel for supporting the liquid crystal panel and the light guide plate;
An LED substrate which is made of a plastic film and in which a part of a mounting scene in which a plurality of LEDs are mounted is disposed on the guide panel and the light guide plate so that the LED is disposed between the guide panel and the light guide plate; And
And a heat radiating sheet disposed below the light guide plate and facing the LED substrate to emit heat generated from the LED. delete delete delete The liquid crystal display element according to claim 1, wherein the heat-radiating sheet is made of graphite. The heat-radiating sheet according to claim 1, wherein the heat-radiating sheet comprises:
A graphite sheet made of graphite; And
And a heat-resistant adhesive formed on said graphite sheet. The liquid crystal display of claim 1, wherein the heat-radiating sheet is made of a metal. 8. The heat sink according to claim 7, wherein the heat radiating sheet comprises:
Copper sheet; And
And a first stainless steel sheet and a second stainless steel sheet attached to the upper and lower surfaces of the copper sheet. The liquid crystal display according to claim 8, wherein the thickness of the copper sheet is 0.03 to 0.05 mm, and the thickness of the first stainless steel sheet and the second stainless steel sheet is 0.02 to 0.04 mm. 8. The heat sink according to claim 7, wherein the heat radiating sheet comprises:
Copper sheet; And
A first stainless steel sheet attached to an upper surface of the copper sheet,
Wherein the copper sheet is in direct contact with the lower cover of the lower portion. The liquid crystal display device according to claim 1, wherein the shape of the heat-radiating sheet is determined according to a layout structure of the LED, an area of the liquid crystal panel, and a material and thickness of the lower cover. The liquid crystal display device according to claim 1, wherein the shape of the heat-radiating sheet is determined according to a region where a component having a low temperature is mounted or a region where a user mainly contacts.

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